EP 0876891 A1 19981111 - Method of obtaining a gas-introduced fiber-reinforced resin injection molding and molding obtained by the same
Title (en)
Method of obtaining a gas-introduced fiber-reinforced resin injection molding and molding obtained by the same
Title (de)
Verfahren zur Herstellung eines faserverstärkten spritzgegossenen Kunststoffgegenstandes mit eingeführtem Gas und so hergestellter gegossener Gegenstand
Title (fr)
Procédé pour obtenir un produit moulé par injection en matière plastique à gaz introduit renforcé de fibres et produit moulé ainsi obtenu
Publication
Application
Priority
- JP 11692097 A 19970507
- JP 18646297 A 19970711
- JP 20015697 A 19970725
Abstract (en)
The present invention is directed to a method of obtaining a gas-introduced fiber-reinforced resin injection molding and to a molding obtained by the method. According to the present invention, there can be obtained a lightweight gas-introduced fiber-reinforced resin injection molding containing glass fibers or like fibers having excellent rigidity and strength and improved surface properties. The method includes the steps of: injecting into a die a molten resin obtained through the plasticization of a molding material; and introducing gas into the molten resin, the molding material comprising fiber-containing thermoplastic resin pellets which contain reinforcing fibers having a length of 2 mm to 100 mm, the reinforcing fibers accounting for 5% to 70% by weight of the molding material, the die including a movable die capable of advancing into and retreating from the internal cavity of the die, wherein after the injection of the molten resin into the die cavity is started, the movable die is retreated to a position where the die cavity assumes a volume corresponding to the molding, and gas is introduced into the molten resin filling the die cavity. <IMAGE>
IPC 1-7
IPC 8 full level
B29C 45/00 (2006.01); B29C 45/17 (2006.01); B29C 45/56 (2006.01)
CPC (source: EP KR US)
B29C 45/0005 (2013.01 - EP KR US); B29C 45/1705 (2013.01 - EP KR US); B29C 45/1706 (2013.01 - EP KR US); B29C 45/1734 (2013.01 - EP KR US); B29C 45/56 (2013.01 - EP KR US); B29C 2045/1707 (2013.01 - EP KR US); B29C 2045/1709 (2013.01 - EP KR US); B29C 2045/171 (2013.01 - EP KR US); B29C 2045/1723 (2013.01 - EP KR US); B29C 2045/1726 (2013.01 - EP KR US); B29C 2045/1737 (2013.01 - EP KR US)
Citation (search report)
- [PA] WO 9729896 A1 19970821 - IDEMITSU PETROCHEMICAL CO [JP], et al
- [A] EP 0421842 A1 19910410 - PEUGEOT [FR], et al
- [A] PATENT ABSTRACTS OF JAPAN vol. 97, no. 5 30 May 1997 (1997-05-30)
- [A] PATENT ABSTRACTS OF JAPAN vol. 95, no. 8 29 September 1995 (1995-09-29)
- [A] PATENT ABSTRACTS OF JAPAN vol. 16, no. 94 (M - 1219) 9 March 1992 (1992-03-09)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0876891 A1 19981111; EP 0876891 B1 20020109; CA 2237064 A1 19981107; CA 2237064 C 20050726; CN 1088646 C 20020807; CN 1219463 A 19990616; DE 69803114 D1 20020214; DE 69803114 T2 20020613; KR 100554781 B1 20060421; KR 19980086655 A 19981205; TW 438658 B 20010607; US 6165396 A 20001226
DOCDB simple family (application)
EP 98108208 A 19980506; CA 2237064 A 19980506; CN 98103251 A 19980507; DE 69803114 T 19980506; KR 19980015168 A 19980428; TW 87106397 A 19980424; US 7390898 A 19980507